Fractional Excretion of Sodium

$FENa = (UNa * SCr)/(SNa * UCr)$

$(UNa)"Urine Sodium"$

$(UCr)"Urine Creatinine"$

$(SNa)"Serum Sodium"$

$(SCr)"Serum Creatinine"$

Tags

The Fractional Excretion of Sodium calculator computes the percent of sodium excretion based on the sodium and creatinine levels of urine and serum.

INSTRUCTIONS:Enter the following:

(UNa) Urine Sodium Level
(UCr) Urine Creatinine Level
(SNa) Serum Sodium Level
(SCr) Serum Creatinine Level

Fractional Excretion of Sodium (FENa): The calculator return excretion level as a percentage.

The Math / Science

The formula for the Fractional Excretion of Sodium is:

$FENa = (UNa * SCr)/(SNa * UCr)$

where:

FENa = Fractional Excretion of Sodium
UNa = Urine Sodium Level
UCr = Urine Creatinine Level
SNa = Serum Sodium Level
SCr = Serum Creatinine Level